Now, the value in TextEntry would be a zero length byte array if
the text record response doesn't contain the value. The problem
is that the value could either be an empty string ("key="), or
there can be no value ("key"), as per rfc6763 6.4 "If there is
no '=' in a DNS-SD TXT record string, then it is a boolean
attribute, simply identified as being present, with no value.".
Bug: 254166302
Test: atest FramworksNetTests
Change-Id: I4eaa5e593ce9ddaa6b6cb2f069c1aef977910796
536cc4d102